Nav drawer and MD

Brian, I believe the current implementation is more complicated than need be.
If you would like, feel free to use the code in here.

Also, according to the design specs (http://android-developers.blogspot.com/2014/10/material-design-on-android-checklist.html): The drawer appears in front of the app bar. It also appears semitransparent behind the status bar.

Take a look, at the PR and comment (preferably in-line) with any suggestions.

Thanks,
Eric